09 5.4L uses oil. Got any ideas?
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Junior Member
Joined: Oct 2020
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i switched to 5w30 a while ago. Didn’t help the consumption.
Senior Member
Joined: Jan 2002
Posts: 5,994
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From: Wilmington,NC
I had a 95 Mark VIII Lincoln for 7 years which is about the same car as your tbird except with the 4V DOHC engine. I loved that car!
Senior Member
Joined: May 2003
Posts: 235
Likes: 4
From: Clinton Tn.
A motor that has run Conventional or on Semi Synthetic all its life might not ever be able to run a Synthetic and some motors like the 5.4 in my 2003 Did not like Mobil1 but was OK with Valvoline. I myself would put 5W 30 Motorcraft Semi Synthetic in it and see what it does.
